论文标题
具有通道估计错误的非正交多访问的错误概率分析
Error Probability Analysis of Non-Orthogonal Multiple Access with Channel Estimation Errors
论文作者
论文摘要
由于其光谱效率，非正交的多重访问（NOMA）对于将来的无线系统非常有前途。在NOMA方案中，不完美的连续干扰取消器（SIC）的影响对误差性能具有主要影响。除了这种不完美的SIC效果外，与所有无线通信系统一样，随着频道估计错误的错误性能也会变得更糟。但是，所有文献都致力于分析Noma系统的错误性能，并在接收器中具有完美的渠道状态信息（CSI），这是非常严格/不合理的假设。在本文中，我们分析了具有不完美的SIC和通道估计错误的NOMA系统的错误性能，更实用的情况。我们在封闭形式中得出了确切的位误差概率（BEP）。所有理论分析均通过计算机模拟验证。然后，我们讨论用户错误性能方面的最佳功率分配，并提出一种新颖的功率分配方案，该方案可实现最大的用户公平性。
Non-orthogonal multiple access (NOMA) is very promising for future wireless systems thanks to its spectral efficiency. In NOMA schemes, the effect of imperfect successive interference canceler (SIC) has dominant effect on the error performances. In addition to this imperfect SIC effect, the error performance will get worse with the channel estimation errors just as in all wireless communications systems. However, all literature has been devoted to analyze error performance of NOMA systems with the perfect channel state information (CSI) at the receivers which is very strict/unreasonable assumption. In this paper, we analyze error performance of NOMA systems with imperfect SIC and channel estimation errors, much more practical scenario. We derive exact bit error probabilities (BEPs) in closed-forms. All theoretical analysis is validated via computer simulations. Then, we discuss optimum power allocation for user fairness in terms of error performance of users and propose a novel power allocation scheme which achieves maximum user fairness.
